@inproceedings{SIGIR-1998-SmithS,
	author        = "Dan Smith and Rattasit Sukhahuta",
	booktitle     = "{Proceedings of the 21st International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	cdrom         = "SIGIR1998/P388.pdf",
	doi           = "10.1145/290941.291077",
	pages         = "388",
	publisher     = "{ACM}",
	title         = "{PWA: An Extended Probabilistic Web Algebra}",
	year          = 1998,
}